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Documentation Example 4 for PROC SEQTEST

/****************************************************************/
/*          S A S   S A M P L E   L I B R A R Y                 */
/*                                                              */
/*    NAME: SEQTEX4                                             */
/*   TITLE: Documentation Example 4 for PROC SEQTEST            */
/* PRODUCT: STAT                                                */
/*  SYSTEM: ALL                                                 */
/*    KEYS: group sequential test                               */
/*   PROCS: SEQDESIGN, SEQTEST, MEANS                           */
/*    DATA:                                                     */
/*                                                              */
/* SUPPORT: Yang Yuan             UPDATE: Aug 21, 2007          */
/*     REF: PROC SEQTEST, EXAMPLE 4                             */
/*    MISC:                                                     */
/****************************************************************/
ods graphics on;
proc seqdesign altref=0.10
               boundaryscale=mle
               ;
   PowerFamily: design method=pow
                       nstages=4
                       alt=upper
                       beta=0.20
                       ;
   samplesize model=onesamplefreq( nullprop=0.6);
   ods output Boundary=Bnd_Prop;
run;
ods graphics off;
data prop;
   do j=1 to 141;
      Resp= ranbin( 511312, 1, 0.60);
      output;
   end;
run;
data prop_1;
   set prop(obs=36);
run;
data prop_2;
   set prop(obs=71);
run;
proc print data=prop(obs=10);
   var Resp;
   title 'First 10 Obs in the Trial Data';
run;
proc means data=Prop_1;
   var Resp;
   ods output Summary=Data_Prop1;
run;
data Data_Prop1;
   set Data_Prop1;
   _Scale_='MLE';
   _Stage_= 1;
   NObs= Resp_N;
   PDiff= Resp_Mean - 0.6;
   keep _Scale_ _Stage_ NObs PDiff;
run;
proc print data=Data_Prop1;
   title 'Statistics Computed at Stage 1';
run;
ods graphics on;
proc seqtest Boundary=Bnd_Prop
             Data(Testvar=PDiff)=Data_Prop1
             infoadj=prop
             boundarykey=both
             boundaryscale=mle
             ;
   ods output Test=Test_Prop1;
run;
ods graphics off;
proc means data=Prop_2;
   var Resp;
   ods output Summary=Data_Prop2;
run;
data Data_Prop2;
   set Data_Prop2;
   _Scale_='MLE';
   _Stage_= 2;
   NObs= Resp_N;
   PDiff= Resp_Mean - 0.6;
   keep _Scale_ _Stage_ NObs PDiff;
run;

proc print data=Data_Prop2;
   title 'Statistics Computed at Stage 2';
run;
ods graphics on;
proc seqtest Boundary=Test_Prop1
             Data(Testvar=PDiff)=Data_Prop2
             infoadj=prop
             boundarykey=both
             boundaryscale=mle
             condpower(cref=1)
             predpower
             plots=condpower
             ;
   ods output test=Test_Prop2;
run;
ods graphics off;
proc seqtest Boundary=Test_Prop1
             Data(Testvar=PDiff)=Data_Prop2
             nstages=3
             boundarykey=both
             boundaryscale=mle
             condpower(cref=1)
             ;
run;